Answer:
Option B is correct.
A double insulated drill generally has a plastic case with the electrical connections and motor insulated within the tool
Explanation:
A double insulated drill's design in real life has plastic casing as the insulator & it wouldn't be a drill without its motor now, would it!?
 
        
             
        
        
        
This is called vaporization.
hope this helps :)
 
        
                    
             
        
        
        
Answer: -31.36 m/s
Explanation:
This is a problem of motion in one direction (specifically vertical motion), and the equation that best fulfills this approach is:
 (1)
  (1)
Where:
 is the final velocity of the supply bag
 is the final velocity of the supply bag
 is the initial velocity of the supply bag (we know it is zero because we are told it was "dropped", this means it goes to ground in free fall)
 is the initial velocity of the supply bag (we know it is zero because we are told it was "dropped", this means it goes to ground in free fall)
 is the acceleration due gravity (the negtive sign indicates the gravity is downwards, in the direction of the center of the Earth)
 is the acceleration due gravity (the negtive sign indicates the gravity is downwards, in the direction of the center of the Earth)
 is the time
 is the time
Knowing this, let's solve (1):
 (2)
  (2)
Finally:
 Note the negative sign is because the direction of the bag is downwards as well.
  Note the negative sign is because the direction of the bag is downwards as well.
 
        
             
        
        
        
Answer:

Explanation:
From the question we are told that:
Distance of wall from CD 
Second bright fringe 
Let
Strontium vapor laser has a wavelength \lambda= 431 nm=>431 *10^{-9}m
Generally the equation for Interference is mathematically given by

Where



 
        
             
        
        
        
Answer:
The maximum height attained by the object and the number of seconds are 128 ft and 4 sec.
Explanation:
Given that,
Initial velocity u= 128 ft/sec
Equation of height
 ....(I)
....(I)
(a). We need to calculate the maximum height
Firstly we need to calculate the time

From equation (I)




Now, for maximum height 
Put the value of t in equation (I)


(b). The number of seconds it takes the object to hit the ground.
We know that, when the object reaches ground the height becomes zero




Hence, The maximum height attained by the object and the number of seconds are 128 ft and 4 sec.